Liquid fuel burner with radiant heating element



se uzs', 1951 J. IMBER LIQUID FUEL BURNER WITH RADIANT HEATING ELEMENT Filed Jan. 18, 1947 2 Sheets-Sheet 1 IGGOOOOOOOOQOOO 000000000000000 INVENTOR. /aaQirzzfiw flMw/ZZ. 234a ATTOHATX o o 070 0 ooooaoi f0 E000o0o003%0900 0o J. IMBER Sept. 25, 1951 LIQUID FUEL BURNER WITH RADIANT HEATING ELEMENT Filed Jan. 18, 1947 2 Sheets-Sheet 2 INVENTOR. wake/r2250,

ATTORNEY Patented Sept. 25, 951

UNITED STATES PATENT OFFICE 2,569,315 .Lr Um FUEL BURNERLWITH RADIANT nm'rme ELEMENT I Jack Imbcr, Greenford, England Application January 1a, 1941. Serial No. 722,873

Great Britain January 23, 19 46 3 Claims. (Cl. 12 6-96) This invention relates to liquid fuel burners, and more particularly to paraflln burners of the wick type above which a radiant element is disposed. The radiant elements used hitherto have been subject to the disadvantages that either they reduce the airflow through theburner to such an extent that the normal functioning 'of the burner is adversely aiiected or they radiate heat back on tothe burner to an undesirable degree. These disadvantages not only prevent uniform heating but in the one case the burner tends to smoke causing the elementto become covered with carbon and cease to glow; In the other case, a burner may be correctly adjusted when cool but after lighting, increased vapour ization due to heat radiated back on to the burner from the element may cause the burner to smoke.

The object of the present invention is toprovide an improved construction or arrangement of radiant element designed to avoid the disadvantages described in the preceding paragraph.

According to the invention an improved radiant element for use with a liquid fuel burner comprises an assembly of thin strips or filaments of heat resisting material disposed in positions substantially parallel to or slightly inclined to the direction of air flow through the burner.

According to the preferred form of the invention a radiant heating element for use with a liquid fuel burner comprises an assembly of thin strips or filaments of heat resisting material, the components of said assembly being connected'to upper and lower rings of heat resisting material, and the upper ring being of smaller diameter than the lower ring which is formed for attachment to a burner. 7 V

Reference will now be made to the accompanying drawings which show examples of heating elements constructed according to the invention and in which:

Fig. 1 is a sectional elevation of an all-metal heating element, I

Fig. 2 is a plan of the element shown in Fig. 1,

Fig. 3 is an elevation looking in the direction of the arrow in-Fig. 2,

Fig. 4 is a sectionalelevation of an alternative form of construction,

Fig. 5 is a plan of the element shown in-Fig. 4, and i i a Fig. 6 is an elevation looking in the direction of the arrow in Fig. 5.

Referring first to Figs. 1 and 3, a radiant element is shown'applicable to a parafiln burner of the annular wick type. This element comprises a number of thin strips 11 of a. heat reslsting metal united at the top and bottom by rings b and c of thesame metal. The upper ring b is of smaller diameter than the lower ring 0 so that the strips a lie in directions slightly inclined to the direction of air flow through the burner. The spaces between the strips are slightly greater than the widths of the individual strips. The lower ringc is formed integral with supports d secured at their lower ends to'a ring e adapted to seat ,on the outer wick tube and support the complete radiant element an appropriate distance above the upper edge of the wick. The outer cylindrical wall H of the depending portion of the ring e is provided with a 'circumfer'entialrow of apertures III, to reduce heat conductionfrom the radiant element to the outer wick tube of the burner employed.

The radiant element above, described may be formed conveniently from a'flat sheet of metal from which portions are stamped out to form the strips a and the upper and lower rings 1) and c. The sheet is then bent into an upwardly converging frusto-conical form and the meeting edges united as by spot welding them together.-

In the form of the invention shown in Figs. 1-6 an element is used in which the radiant portion is mainly composed of filaments disposed substantially parallel to the direction of the airflow through the burner above the flame. These radiant filaments may be composed of asbestos string with nickel wire centre wound ona supporting frame of heat resisting material in such a manner that the component filaments are all inside the frame. The frame is in the form of two rings 1 and g rolled from flat strip and disposed one above the other so that they lie substantially edge on to the air-flow and thus offer the least possible resistance to it. The upper ring 1 is supported from the lower ring g by arms h which may be integral with the rings or welded to them, which arms h are radiating members to the degree to which they are heated by the flame of the burner. The upper edge of the nearly parallel to the direction of air flow through the burner and ensures the maximum heating of each filament uniformly along its length. The element shown in Figs. 4-6 is shown supported from a ring e as in Figs. 1-3

but this form of mounting is shown by way of example only as the element of either form can besupported in a variety of ways according to the, particular burner construction to which it is. applied. 7

In each of Figs. 1 and 4, the upper portion of a liquid fuel burner oi known construction issued May 5, 1931, to Cortland W. Davis ior;;

an improvement in Blue Flame Mantle Lamps.

As shown in Figs. 1 and 4, the burnerincludesfl an outer wick tube 12, an annular wick ii-fan inner wick tube I4, a flame spreader I5-carriedyl0 by the upper end of the inner wick tube ll to supply inner air to the annular name or fthe': burner, and a burner cone l6 concentrically around and having its inner circular edge 1 1 substantially spaced fr 'orn the flame spreader L5,,to-supply outer airto the. burner fiame, all oifthesdburnerparts being related'tor each other and operating to produce a blue annular 'flame inthe manner generally and more specifically described in' said reissued patent.

.[The annular flame produced by the. burner extends upwardly and centrally into the radiant. element of eachf-of .liigs.v 1 and 4, through the circular, central opening IT in the ring e forming-fa part of each of said radiant elements, which opening 11. surrounds and is spaced from the b'ase of the-Iannular flame, to project into and against said flame, the outer air required to. efiect complete combustion of the vaporized fuel. llt will be noted that the lower portion of .the ring e in each case, is of substantially thesameiorm and proportions, as the burner cone 2240f said reissued-patent In the present application/the burner cone 5 is shown as supportedLfrorn the outer wick tube [2 by'a frustoconical baflle. 1.8 .containingan annular row of large diameter. perforations 19 to adequately supjplyair from the .lower portion of the burner (not shown),, tobeneath the burner cone 16; .for direction therebyinwardly to constitute the outer air supplied to the burner. flame. The radiant. elements of the invention may have'other. forms offisupport nom the burner structure, depending on the type and form of the burner employed in. any case. t e V I In using either form ofthe invention described, it has been found that the best results are obtained .if the lower ring of the support .is between .1 and-1V2 times the wick diameter and is ..sit.ua.ted iromf fir to. of the wick diameter. above the burner. The size .ensures thatthe ring does not. materially affect the. air flow through the burner, whilstthespacing from the. burner ensures that theheat ,radiated back on to, the burner is .n0t excessive. ,Support .rings made. in accordance with the-above dimensions. are heatedto redness. .by.-contact..with. the. glowing strips or filaments and .form part of. the radiant element.

The diameter and position of .theupper support-ring must be chosen to. suitthe particular burner used; whereby the temperatureoi this ring canbe raised to that of..dull redheat.

1-. .In combinations, radiant heating element and a liquid. fuel uburnerrrof the. annular. wicktype, said heating element. including vertically. extending radiating members in vupwardly con; verging frusto-conical. arrangement. .around. a vertical axis,..-an upper and horizontally disposed first. ring. connected with. the upper ends .of said radiating members, .ajlower. and horizontally disposed second ring of larger diameter than said andsconnected with the lower ends of said radiating members and having supporting connection with said upper ring, a mounting ring spaced belowand substantially parallel with and supporting said second ring, and having a central flame admission opening, and a liquid :fuel burner of the annular wick type coaxial with said heating element and supporting said mounting ring and for projecting an annular "'fl'arn'e' upwardly through said central opening .and-hetwc1en*and to directly heat said radiating members.

' ;2 flln'combination,"a radiant heating element "and 'a"l'i'quid fuel burner of the annular wick t nsel-said heating element including vertically extending radiating members in upwardly converging r frusto-conical arrangement around a vertical axis, anupper and horizontally disposed first ringconnected with the upper ends of said radiating members, a lower and horizontally disposed .second ring ofwlarger diameter than said first ring and connected with the lower ends otsaid radiatingmembers and having supporting connection with said" upper ring, a mounting ringspaoedbelow andsubstantially parallel withandsupporting said. second ring and having a central flame admission opening, and a liquid f-uelburner of the annular wick type coaxial with said heating element and supporting said mounting ring and for projecting an annular flame upwardly through said central opening and between and to directly heat said radiating members, said radiating members comprising spaced metal strips integral with said first and said second rings. 7

3. .In combination, a radiant heating element and a. liquid fuel burner of the annular wick type said. -heating. element including vertically extendingradiating members in upwardly converging irusto-conical arrangement around a A vertical :axis, ,anupper and horizontally disposed first ring connected-with the upper ends of'said radiating members, a lower and horizontally disposed second ring of larger diameter than said first ring and connected with the lower ends of saidradiating-members and having supporting connection with said upper ring, a mounting ring spaced below and substantially parallel with and supporting-said second ring and having a central fiame admission opening, and a liquid fuel burner of the annular wick type coaxial with said heating element andsupporting said mounting ring and for projecting an annular flame upwardly through said central opening and-betweenand to directly heat said radiating members, said burner including a burner conefor directing outer air to the flame of the burner,

said .-mo unting ring including a horizontallydi'sposed disk of metal containing said central opening andcomprising said burner cone.

JACK IMBER.

REFERENCES CITED The-following references are of. record in the file of this patent:

' UNITED STATES PATENTS 15123327 Great Britain July 23,1940 

